Fundamentals BroadNet answer

What is DTMF?

Last reviewed July 22, 20261 min readReviewed by BroadNet engineering

Quick answer

DTMF (Dual-Tone Multi-Frequency) is the signaling produced when a caller presses a phone keypad — each digit is a pair of audio tones the network decodes. It is how callers navigate IVR menus ('press 1 for sales') and enter data like account numbers or a voice-OTP confirmation. In VoIP, DTMF is commonly sent out-of-band (RFC 2833 / telephone-event) rather than as in-band audio, so it survives compression. See /answers/what-is-ivr and /answers/programmable-voice.

Plain-language definitionVendor-neutralReviewed July 22, 2026

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